When Symbian Anna was released, some phones such as Nokia series N8, C7, the new Communicator E7, or C6-01 which is a line of high end Nokia still use Symbian OS-3. Four mobile phones are like the last troops from the Symbian version 3. But only recently, four of this series can be upgraded its OS to Symbian Anna has been used in the series X7-00 and E6.
Nokia N8 Unlocked GSM Touchscreen Phone Featuring GPS with Voice Navigation and 12 MP Camera--U.S. Version with Warranty (Silver/White)
Symbian apparently done with a gradual increase in the operating system. So, after Symbian Anna, the new version has also been prepared with the name of Symbian Belle. It actually has to be expected since Anna was released. The indication is the use of the name and the most striking is that Anna is not too experienced a drastic change from the Symbian 3, except that the menu icons are visibly different.
Nokia C6 Unlocked GSM Phone with Easy E-mail Setup, Side-Sliding Touchscreen, QWERTY, 5 MP Camera, and Free Ovi Maps Navigation (Black)
Many observers speculate and say that Belle will be a lot intended to improve the graphics performance of the screen, because it takes the processor 1 GHz. Nokia itself for the first time released a phone with this high speed on a series of Nokia 500, which still use the Symbian Anna.
Nokia E7 Touchscreen , 8MP Camera , HD Recording , 16 GB ,3G Unlocked Int'l Smartphone (Dark Gray)
Perhaps the Belle version will accommodate the 3D view on the screen as used in LG Optimus 3D. Improved access and internet browsing method also seems to be a consideration, including chat and social media.